CHEMICAL COMPOSITION IN SOLID FORM FOR USE IN A MECHANICAL, NON-ELECTROLYTIC SYSTEM ADAPTED TO PLATE METAL PARTS, SAID SYSTEM BEING TO TUMBLE SAID PARTS IN A TUMBLING BARRELO WITH POWERED METAL, SMALLSPHERICAL PARTICLES (E.G., GLASS BEADS AND SAID CHEMICAL COMPOSITION, THE TUMBLING ACTION CAUSING THE POWDERED METAL TO FORM INTO A DENSE, CONTINUDUS, ADHERENT COATING ON SAID METAL PARTS.